A medical helicopter evacuates victims from a "Congress on Your Corner" event in Tucson, Arizona, where U.S. Representative Gabrielle Giffords (D-AZ) among others were shot and seriously wounded, in this still image taken from video released on January 8. 2011. Giffords, a 40-year-old Democrat in her third term in the U.S. House of Representatives, was airlifted to a hospital in Tucson on Saturday shortly after being shot in the head at point blank range at a Safeway supermarket in the Arizona city. [Xinhua]